US Bridges

LA0304 over Bayou Lonion

Fair

Lafourche Parish, Louisiana · 5.72 MI North of LA 308 · Structure no. 022908290405721

Built
1980
45 years old
Condition
Fair
inspected August 2024
Type
Slab
Concrete
Length
80 ft
4 main spans
Daily traffic
1,518
2021 count
Owner
State
State Highway Agency

About this bridge

LA0304 over Bayou Lonion is a concrete slab carrying LA0304 over Bayou Lonion in Lafourche Parish, Louisiana. It was built in 1980, so it is 45 years old, older than the Louisiana average of 43 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 1,518 vehicles a day, roughly 12% of them trucks, projected to reach 1,669 by 2041. The structure is 80 ft (24.4 m) long and 37 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesLA0304
CrossesBayou Lonion
Location5.72 MI North of LA 308
RouteState Highway 304
CountyLafourche Parish
StateLouisiana
Coordinates29.87298, -90.8243
Functional classRural Minor Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating44 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length80 ft (24.4 m)
Longest span20 ft (6.1 m)
Deck width37 ft (11.3 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,518 (2021)
Projected traffic1,669 by 2041
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was LA0304 over Bayou Lonion built?

It was built in 1980, making it 45 years old in 2025.

What condition is LA0304 over Bayou Lonion in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2024.

How much traffic does LA0304 over Bayou Lonion carry?

About 1,518 vehicles per day (2021 count), of which roughly 12% are trucks.

How long is LA0304 over Bayou Lonion?

The structure is 80 ft (24.4 m) long with a longest span of 20 ft (6.1 m) and a deck 37 ft wide.

Who owns LA0304 over Bayou Lonion?

It is owned by the State Highway Agency.